Year Percent 1996-01-01 -6.55830 1997-01-01 13.31360 1998-01-01 8.03181 1999-01-01 15.25290 2000-01-01 9.25375 2001-01-01 9.47938 2002-01-01 18.79760 2003-01-01 19.51530 2004-01-01 16.83700 2005-01-01 19.55910 2006-01-01 21.86770 2007-01-01 27.64860 2008-01-01 7.91545 2009-01-01 17.01980 2010-01-01 17.37860 2011-01-01 15.41920 2012-01-01 11.99650 2013-01-01 11.83030 2014-01-01 13.89780 2015-01-01 11.16430 2016-01-01 15.46860